402664401 has 6 divisors (see below), whose sum is σ = 581626370. Its totient is φ = 268442928.

The previous prime is 402664319. The next prime is 402664417. The reversal of 402664401 is 104466204.

It can be written as a sum of positive squares in only one way, i.e., 400040001 + 2624400 = 20001^2 + 1620^2 .

It is not a de Polignac number, because 402664401 - 2¹³ = 402656209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402664441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22370236 + ... + 22370253.

Almost surely, 2^402664401 is an apocalyptic number.

It is an amenable number.

402664401 is a deficient number, since it is larger than the sum of its proper divisors (178961969).

402664401 is a wasteful number, since it uses less digits than its factorization.

402664401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44740495 (or 44740492 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 402664401 is about 20066.4994705105. The cubic root of 402664401 is about 738.4386369425.

The spelling of 402664401 in words is "four hundred two million, six hundred sixty-four thousand, four hundred one".